> Okay, Jeff I'll look around for a 741 op-amp circuit.
 > Any ideas where to look?
The 741 is probably around .50cents, Stan - comes with printed material 
(sometimes) on circuit ideas.
 > Thanks for the reply!  Any ideas if a signal generator would help
 > me set the center operating frequency?
Meaning?
 > And if so, how would I hook it up?
Depends on what you wanna do wiht it...
   73 = Best Regards
   -Jeff KA5THB
   ka5thb@bigfoot.com
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